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Localization of Caspr2 in Myelinated Nerves Depends on Axon–Glia Interactions and the Generation of Barriers Along the Axon

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Localization of Caspr2 in Myelinated Nerves Depends on Axon–Glia Interactions and the Generation of Barriers Along the Axon The Journal of Neuroscience, October 1, 2001, 21(19):7568–7575 Localization of Caspr2 in Myelinated Nerves Depends on Axon–Glia Interactions and the Generation of Barriers along the Axon Sebastian Poliak,1 Leora Gollan,1 Daniela Salomon,1 Erik O. Berglund,2 Reiko Ohara,3 Barbara Ranscht,2 and Elior Peles1 1Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel, 2The Burnham Institute, Neurobiology Program, La Jolla, California 92037, and 3Department of Human Gene Research at Kazusa DNA Research Institute, Chiba 292-0812, Japan Cell recognition proteins of the contactin-associated protein before relocating to the adjacent juxtaparanodal region. This (Caspr) family demarcate distinct domains along myelinated transition was not observed in CGT mice, where Caspr2 and axons. Caspr is present at the paranodal junction formed be- Kv1.2 remained paranodal. Double labeling for Caspr and tween the axon and myelinating glial cells, whereas Caspr2 is Caspr2 demonstrated that these two related proteins occupied localized and associates with K ϩ channels at the adjacent mutually excluding domains along the axon and revealed the juxtaparanodal region. Here we investigated the distribution of presence of both paranodal and internodal barrier-like struc- Caspr2 during development of peripheral nerves of normal and tures that are delineated by Caspr. Finally, we found that the galactolipids-deficient [ceramide galactosyl transferase disruption of axon–glia contact in CGTϪ/Ϫ nerves also affects (CGT)Ϫ/Ϫ] mice. This mutant exhibits paranodal abnormalities, the localization of the cytoskeleton-associated protein 4.1B lacking all putative adhesion components of this junction, in- along the axon. Altogether, our results reveal a sequential ap- cluding Caspr, contactin, and neurofascin 155. In sciatic nerves pearance of members of the Caspr family at different domains of this mutant, Caspr2 was not found at the juxtaparanodal along myelinated axons and suggest that the localization of region but was concentrated instead at the paranodes with Caspr2 may be controlled by the generation of Caspr- Kv1.2. Similar distribution of Caspr2 was found in the PNS of containing barriers along the axon. contactin knock-out mice, which also lack Caspr in their para- nodes. During development of wild-type peripheral nerves, Key words: Caspr2; myelin; node of Ranvier; axo-glial Caspr2 and Kv1.2 were initially detected at the paranodes junction; Schwann cells; K ϩ channels Saltatory conduction depends on the generation of specialized point of contact that is formed between the axolemma and the domains along myelinated axons in which different sets of ion paranodal loops of the myelinating cells (Rosenbluth, 1995). channels are present (Arroyo et al., 1999; Peles and Salzer, 2000). The axonal membrane at the paranodes contains a complex of At the node of Ranvier, the axonal membrane contains high cell adhesion molecules that include Caspr (also known as ϩ concentrations of voltage-gated Na channels that are responsi- paranodin) (Einheber et al., 1997; Menegoz et al., 1997; Peles ble for the regeneration of the action potential (Waxman and et al., 1997) and the glycosylphosphatidyl inositol-linked cell Ritchie, 1993). The juxtaparanodal region is located beneath the adhesion molecule contactin (Rios et al., 2000; Boyle et al., compact myelin at both sides of each internodal interval and 2001). A glial component of the paranodal junction was re- ϩ contains delayed rectifier K channels of the Shaker family, cently identified as neurofascin 155 (NF155), a spliced isoform Kv1.1, Kv1.2, and their Kv␤2 subunit (Wang et al., 1993; Rhodes of the cell adhesion molecule neurofascin that is specifically et al., 1997; Vabnick and Shrager, 1998; Rasband and Shrager, found at the glial loops (Tait et al., 2000). A schematic diagram 2000). These channels colocalize and create a complex with summarizing the proteins found in the various subdomains at Caspr2, the second member of a growing family of putative cell the nodal region is presented in Figure 9. recognition molecules that demarcate distinct domains along my- ϩ The generation and maintenance of specialized domains in elinated fibers (Poliak et al., 1999). The juxtaparanodal K chan- ϩ myelinated fibers are controlled by glial contact and intrinsic nels and Caspr2 are separated from the Na channels at the node determinants within the axon (Peles and Salzer, 2000). Although of Ranvier by the paranodal junction, a specialized septate-like the exact mechanisms involved are not completely understood, such organization may require the presence of barriers along the Received May 30, 2001; revised July 12, 2001; accepted July 18, 2001. axon that restrict the diffusion of axonal proteins (Winckler et al., This work was supported by grants from the National Multiple Sclerosis Society 1999). Such barriers may be present at the paranodal junction. (Grant RG-3102), the United States–Israel Science Foundation (BSF), Jerusalem, Israel, and the Minerva Foundation to E.P. and from the National Institutes of Although structurally distinct, the paranodal junctions were sug- Health (NS38397) and the March of Dimes Birth Defects Foundation (FY00-240) to gested to function similarly to tight junctions by providing a fence B.R. E.P. is an Incumbent of the Madeleine Haas Russell Career Development Chair. We thank Brian Popko for his generous support in making the CGTϪ/Ϫ mice that restricts the movement of membrane proteins, thereby con- available to us and Jim Trimmer for his kind supply of antibodies to ion channels. fining them to specific domains along the axolemma (Rosenbluth, Correspondence should be addressed to Dr. Elior Peles, Department of Molecular 1995). The importance of axo-glial contact for the proper gener- Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel. E-mail: [email protected]. ation of axonal domains is further supported by the analysis of Copyright © 2001 Society for Neuroscience 0270-6474/01/217568-08$15.00/0 mutant mice with defective paranodal junctions. These include Poliak et al. • Caspr-Dependent Localization of Caspr2 J. Neurosci., October 1, 2001, 21(19):7568–7575 7569 mice deficient for contactin (Berglund et al., 1999; Boyle et al., RESULTS 2001) and galactolipids-deficient mice (Dupree et al., 1999). The Paranodal junction components in CGT and latter lack the enzyme UDP-galactose/ceramide galactosyl trans- contactin mutants ferase (CGT) and are incapable of synthesizing the two major Previous work showed that Caspr is either absent or only weakly myelin galactolipids galactocerebroside (GalC) and sulfatide (Co- present in the paranodes of galactolipids mutant mice (Dupree et etzee et al., 1996; Bosio et al., 1998). Both of these paranodal al., 1999). It was suggested that the paranodal defects observed in mutants lack the transverse bands that are thought to represent this mutant result from inappropriate targeting of a glial adhesion the septate-like junctions in peripheral myelinated nerves and component to the paranodal loops (Dupree et al., 1999; Popko, exhibit abnormal localization of Caspr and Kv1.1 along their 2000). To further characterize this mutant, we examined the axons (Bosio et al., 1998; Dupree et al., 1998, 1999; Boyle et al., distribution of contactin and NF155, two adhesion molecules that 2001). To further understand the molecular mechanisms involved are found at the neuronal and glial sides, respectively, of the in the generation and maintenance of distinct functional domains paranodal junction (Rios et al., 2000; Tait et al., 2000). Although along myelinated axons, we have investigated the distribution of in wild-type animals NF155 and contactin show a similar distri- the Caspr2/Kv1.2 complex during development of peripheral bution to Caspr at the paranodes and the mesaxon, in CGTϪ/Ϫ nerves in wild-type and paranodal mutant mice. Our findings mice these adhesion molecules were hardly detected in the para- suggest that the localization of these proteins depends on the nodal region (Fig. 1). As observed in wild-type nerves (Tait et al., presence of axonal barrier-like structures that are outlined by 2000), NF155 was still detected in the Schmidt–Lanterman inci- Caspr at the paranodal junction and along the internodal sures (data not shown), indicating that it was specifically mislo- membrane. calized at the paranodes and the mesaxon. Similarly, NF155 staining was markedly reduced in the paranodes of contactin MATERIALS AND METHODS mutant mice, which also exhibit disruption of the paranodal septate-like junction (Fig. 1) (Boyle et al., 2001). In both para- Animals and antibodies. Generation and genotyping of CGT and contac- tin null animals have been described previously (Coetzee et al., 1996; nodal mutants, some residual NF155 staining could be detected Berglund et al., 1999). Wild-type control animals were derived from the occasionally in the paranodal loops, but it was clearly distinct same litters. Antibodies to Casprs include polyclonal antibodies P6061 from the wild-type nerve and did not appear to be concentrated and P4344 directed to the intracellular region of Caspr or Caspr2, at the paranodal junction. These observations indicate that local- respectively, as well as monoclonal antibody M275, which is directed to ization of the different adhesion components at the paranodal the extracellular domain of Caspr (Peles et al., 1997; Poliak et al., 1999). ϩ Monoclonal antibodies against Na channels and Kv1.2 (Bekele-Arcuri junction is interdependent,
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